Wrench



Nov. 1, 1932.

H. A. SCISINGER 1,885,954

WRENCH Filed July 50. 1931 gwmmtoz 7542/04? d Jaw/2 4% Patented Nov. 1, 1932 UNITED STATES PATENT OFFICE HARRY A. SCISINGEB, OF TOLEDO, OHIO, ASSIGNOR OF ONE-HALF TO ADOLPH PETERS,

OF TOLEDO, OHIO WRENCH Application filed July 30, 1931. Serial No. 553,979.

My invention has for its object to provide an efficient automaticwrench that is so constructed that reverse movement of the handle of the wrench will automatically release the jaws of the wrench from an object operated on, and a forward movement will automatically cause the jaws to grip the object. The invention also provides a means for releasement of the movable jaw of the wrench U by manipulation of the handle to enable ready setting of the wrench to the size of the object to be operated upon. w

The invention consists in other features and advantages which will 'appear from the following description and upon examination of the drawing. Wrenches containing the invention may partake of different forms and may be varied in their details and still embody the invention. To illustrate a practical application of the invention, I have selected a wrench embodying the invention as an example of the various structures, and

the details of such structures that contain the invention, and shall describe the selected structure hereinafter, it being understood that variations may be made and that certain features of my invention may be used to advantage without a corresponding use of other features of the invention, and without departing from the spirit of the invention. The particular structure selected is shown in the accompanying drawing.

Fig. 1 illustrates a side view of the wrench containing my invention and selected as an example. Fig. 2 is a rear view of the wrench. Fig. 3 illustrates a broken view of the wrench when parts are 1n relatively different positions from that shown in Fig. 1. Fig. i is a view of a section of the wrench when the parts are in the positions shown in Figs. 1 and 2.

The particular wrench shown in the drawing has a jaw 1 and a handle 2 which are connected together by means of a pin 3 that extends through the jaw and the handle. The pin 3 is connected to the handle and is rotatable in a hole 4 formed in the jaw 1. The wrench is also provided with a jaw 6 which cooperates with the jaw 1 to engage objects that are to be operated upon by the wrench.

The jaw 6 is slidably supported with respect to the 1 and is engaged by the handle 2 to cause the object to be clamped between the jaws 1 and 6. The jaw 6 has a rack 7 that is slidably movable in the channel 9 that extends through the jaw 1. The handle 2 has a sector gear that meshes with the rack 7 and rotation of the handle 2 operates to move the jaw 6 towards the jaw 1 and to clamp any object that may be located between the jaws. The movement of the jaw 6, however, is limited to the rotative movement of the sector gear 8 that is formed on the inner end of the handle 2 and in order to manipulate objects of difierent sizes, means is provided for setting the jaw 6 at different points, depending upon the size of the objects that are to be operated upon.

' The jaw 1 is provided with a slot 12 that ex tends to the opening 4 .and into which the pin 3 may be drawn to withdraw the sector gear 8 from its meshing relation with the rack 7, whereupon the jaw 6 may be shifted to any point with respect to the jaw 1 and upon relocation of the handle 2 by movement of the pin 3 into the hole 4, the teeth of the rack and gear interengage and the jaw 6 may again be moved so as to clamp the object between the jaws 1 and 6. The pin 3 is provided with end portions that are oblong in their cross sec- 80 tions. The end portions have flat sides 13 and cylindrical ends 14. The cylindrical ends 1e are formed to fit .thecylindrica l hole 4, while the distance between the flat sides 13 is such that they will fit the sides of the slot 12 which extends from the hole 4. Consequently, the handle 2 may be placed in position, such as shown in Fig. 3, so that the end portions of the pin .3 may enter the slots 12 which will remove the sector gear 8 from meshing relation with respect to the jaw 1 to any desired point. The handle 2 is then moved so that the pin 3 is located in the hole 1 and the sector gear is again placed in meshing relation with the rack 7 whereupon the movement of the handle 2, relative to the jaw 1, will cause the jaws to move towards each other.

In order to enable the wrench to operate automatically, .a spring 18 is secured to the jaw 1 by means of the screw 19 and is pro 100 vided with an end portion that engages the edge of the handle 2 to cause the handle to move into a position so that the end portions of the pin 3 cannot enter into the slot 12 except on movement of the handle 2, relative to the jaw 1, so as to overcome the yielding resistance of the spring 18. The end 20 of the spring engages in a recess 21 formed in the edge of the handle and is tensioned to press the sector 8 against the rack 7. This prevents disengagement of the sector gear 8 and the rack 7 and also operates to normally cause the clamping operation of the jaws, since the end of the spring 18 presses against the handle 2 at a point, with respect to the pin 3 as to cause the handle 2 to rotate in a direction to produce the clamping operation of the aws. Also the spring 18 operates to keep the sector gear 8 against the rack 7 and prevent any looseness therebetween and rattling of parts. When it is desired to manipulate an object, such as a nut or a bolt, the handle 2 is moved relative to the jaw 1 so that the end portions of the pin 3 are drawn into the slot 12 and the jaw 6 is placed in position. Upon insertion of the pin 3 in the hole 4, and consequent releasement of the handle with respect to the aw 1, the spring 18 causes the jaws to clamp. F urther movement of the handle 2 first causes the jaws to tightly clamp the object and then r0- tate the object. If the object has suflicient resistance to reverse rotation as to overcome the yielding resistance of the spring 18, by the movement of the handle 2, the jaws will be first unclamped and maybe moved around by reason of the spring so as to engage the object at another point and then a forward movement of the handle 2 will again rotate the object another step. This may be repeated until the object has been completely loosened as in the case of a nut from a bolt.

Thus, by my invention, I have provided an exceedingly eflicient adjustable wrench that automatically operates to produce a step by step movement in the object by repeated rotative movements of the wrench.

I claim:

1. In a wrench, a jaw, a' handle, a pin connected to the handle, the end portions of the 9 pin being oblong in their cross sections and having cylindrical end portions, the said jaw having a hole and a slot connecting the hole, the end portions of the pin located in the hole, the oblong end portions having cylindrical surfaces fitting the hole and lateral surfaces fitting the slot, a second jaw, a rack connected to the second jaw and slidably movable relative to the first named jaw, the handle having a gear part meshing with the rack for moving the second named jaw relative to the first named jaw when the handle is pivotally moved, the mesh connection between the rack and the gear part being disconnected by the slidable movement of the handle relative to thefirst named jaw to move the pin into the slot, a spring interengaging the first named jaw and the handle for yieldingly resisting the pivotal movements of the handle relative to the first named jaw in one direction and normally preventing the entrance of the pin into the slot.

2. In a wrench, a jaw, a handle, a pin for pivotally supporting the handle on the jaw,

a second jaw slidably movable in the first named jaw, a rack connected to the second jaw, the handle having a gear part meshing with the rack for moving the second named jaw relative to the first named jaw when the handle is pivotally moved, means for slidably supporting the handle in the first named jaw when the handle is pivotally moved to one position for connecting and disconnectin the gear part of the handle with the rac a spring interengaging the first named jaw and the handle for yieldingly resisting pivotal movements in one direction and for operating the handle to move the second named jaw a short distance towards the first named jaw, and to resist movement of the handle to a position to enable sliding movements of the handle to disconnect the gear portion of the handle from the rack. V

In witness whereof I have hereunto signed my name to this specification.

HARRY A. SCISIN GER. 

